Display screen or portion thereof with an animated graphical user interface



2.1: First image

2.2: Second image

2.3: Third image

4.1: First image

4.3: Second image

4.5: Third image

The process or period in which one image transitions to another image forms no part of the claimed design.

The broken line showing of the phone and the display screen or a portion thereof is for the purpose of illustrating environment and forms no part of the claimed design.

The broken line showing of elements on the display screen illustrate portions of the graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with an animated graphical user interface, as shown and described. 